Yes, fitting inside a drawer does not guarantee that the intended air path remains clear. Check the model's loading diagram and avoid bridging or covering outlets.
What the observation tells you
A broad flat box can obstruct a grille more effectively than several smaller packs. It may also project behind the drawer or keep its front from seating fully. Forcing the drawer shut can damage the box and the fitting.
A useful next step
Choose a suitable portion shape and location, keep clearances intact and close the drawer gently. If poor cooling began after a new packaging arrangement, include that change in the repair account.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.